American National Standard
Test Procedure and Acceptance Criteria for Prime Painted Steel Surfaces for Steel Doors and Frames
Revision and Redesignation of ANSI/SDI A224.1-1990
|Table of Contents|
|3.1 Salt Spray Test|
|3.2 Condensation Testing (Humidity)|
|3.3 Impact Test|
|3.4 Film Adhesion Test|
|4.1 Salt Spray Resistance|
|4.2 Condensation Resistance|
|4.3 Impact Test|
|4.4 Film Adhesion|
|6.1 Testing Laboratory|
|Classification of adhesive test results|
|Visual reference for percentage of rust|
|Blister size #2|
|Blister size #4|
|Blister size #6|
|Blister size #8|
These methods prescribe the procedures to be followed in the selection of material, chemical preparation, painting, testing, and evaluation of prime painted steel surfaces for steel doors and frames.
2.1 The test specimen shall be the exact type and gauge of steel used in the manufacturing of the product. It shall be 4″ x 10″ with a 1/4″ hole at the center of the 4″ width, 1/2″ in from the end. When a specimen greater than 10″ in length is used for the coating process, the bottom 10″ of the specimen shall be used for all subsequent testing.
Permanent identification marks shall be added to the specimen as required for control purposes.
2.2 The specimen(s) shall be hung using a method representative of that used in production.
2.3 The specimen(s) shall be cleaned, pretreated and painted in accordance with the manufacturer’s normal production method and procedure. All coating weights used on test specimens shall be documented and representative of the individual manufacturer’s normal production material.
2.4 At the end of the paint cycle, the specimen(s) shall be removed from the paint system with careful handling. The painted surface of the specimen shall not be handled or come in contact with other objects to prevent disruption of the painted surface.
2.5 All specimens shall be aged a minimum of 72 hours prior to testing.
3.1 Salt spray test
a) Apparatus — The apparatus used for salt spray testing shall be of such design as to conform to ASTM B117-09, Standard Practice for Operating Salt Spray (Fog) Apparatus. b) Test performance — Salt spray testing shall be conducted as specified in ASTM B117-09, Standard Practice for Operating Salt Spray (Fog) Apparatus for a test period of 120 continuous hours. The test specimen(s) shall be scribed with an “X” per ASTM D1654-92(2000) Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments, sections 4.1 and 5.1.
3.2 Condensation testing (humidity)
a) Apparatus — The apparatus used for condensation (humidity) testing shall be of such design as to conform to ASTM D4585-99, Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation. b) Test performance — Condensation (humidity) testing shall be conducted as specified in ASTM D4585-99, Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation, for a test period of 240 continuous hours. Exposure temperatures shall be maintained at a minimum of 100° Fahrenheit. Actual test temperature shall be noted in the report.
3.3 Impact test
The paint shall be tested per ASTM D2794-93 (2010)e1 Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact), with 20 inch pounds of direct impact using a Gardner Impact Tester with 1/2″ diameter ball or punch at room temperature of 70° – 75° Fahrenheit. After impact is made, apply 3/4″ wide #600 Scotch cellophane tape firmly to the impact area and pull off sharply.
3.4 Film adhesion test
The coating film adhesion shall be tested in accordance with method “B” of ASTM D3359- 09e2, Standard Test Methods for Measuring Adhesion by Tape Test. A total of (11) parallel cuts are made with a sharp instrument, 1 mm apart in both a vertical and horizontal direction forming a grid. One inch wide pressure-sensitive tape is then firmly applied to the scribed surface and rapidly removed.
4.1 Salt spray resistance
The paint film on the unscored surface of the test specimen shall have a rust grade of no less than 6 as defined in ASTM D610-01, Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces. Table 1 shall be used to evaluate the rust grades. The paint film at the scored line shall not be undercut by rust more than 1/8″ each side, when tested in accordance with paragraph 3.1.
4.2 Condensation resistance
The paint film may have any quantity of #8 blisters but, shall have no more than a few #6 blisters as illustrated in ASTM D714-02(2009), Standard Test Method for Evaluating Degree of Blistering of Paints, when tested in accordance with paragraph 3.2. Visual representations of the various degrees of blistering are shown in Figures 2 through 5.
4.3 Impact test
No paint film removal shall occur other than at an area 1/8″ in diameter at the center of the impact area, when tested in accordance with paragraph 3.3.
4.4 Film adhesion
There shall be no adhesion loss less than a grade 3B as defined in ASTM D3359-09e2. This grade represents a film removal of between 5 and 15%. Table 2 illustrates the various classifications for adhesion loss.
5.1 The report shall cover the date the test was performed and the issue date of the report.
5.2 Identification of the specimen tested, source of supply, manufacturer, model or series number, or both, and any other pertinent information.
5.3 A detailed description of the specimen or specimens tested shall include the type of prime paint, the method of paint application, the procedure used to cure it, and the dry film thickness.
5.4 A statement that the test or tests were conducted in accordance with the methods and procedures as specified herein. If deviations from these methods and procedures were made, they shall be described in the report.
5.5 When the test is made to check the conformance of the unit specimen to test requirements of a particular specification, the identification or description of the specification shall be included in the report.
6.1 Testing laboratory
All tests shall be conducted and/or certified by a nationally recognized, independent testing laboratory accredited in accordance with ISO 17025 for the test methods referenced in the standard.
Reference may be made to this specification. When reference is made, the following statement shall be used: Prime finish has been tested in conformance with ANSI Standard A250.10-1998.
Maximum % of rusted area
Surface of cross-cut areas from which listing has occurred. (Example for six parallel cuts.)
Rate of adhesion
|The edges of the cuts are completely smooth; none of the squares or the lattice are detached.|
|Small flakes of coating are detached at intersections; less than 5% of the area is affected.|
|Small flakes of coating are detached along edges and at intersections of cuts. The area affected is 5 to 15% of the lattice.|
|The coating has flaked along the edges and at parts of the squares. The affected area is 15 to 35% of the lattice.|
|The coating has flaked along the edges of cuts in large ribbons and entire squares have detached. The area affected is 35 to 65% of the lattice.|
Flaking and detachment in excess of 65%.